Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of travel infotainment master Travelzoo (Nasdaq: TZOO) popped 12% above last night's closing price in a highly unusual trading pattern.

So what: Travelzoo reported earnings last night, the day after fellow online travel resource (Nasdaq: PCLN) blew the lid off its own earnings report. Trading was light to medium all day long and share prices climbed slowly -- until a rash of large orders cleared after 3 p.m. and pushed both price and dollar volume to surprising levels.

Now what: The stock has now gained 144% over the last year and more than tripled from lows set in early July. The stock also jumps every time Yahoo! (Nasdaq: YHOO) talks about expanding its travel-related services or Google's (Nasdaq: GOOG) long-running acquisition of ITA Software takes another step forward or backward. Travelzoo is no penny stock, but often behaves like one regardless.

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Fool contributor Anders Bylund holds no position in any of the companies discussed here. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is investors writing for investors.